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                                <div class="api-method"><div class="api-method-definition"><h1 id="reconcilechildren">reconcileChildren</h1><p>&#x8BE5;&#x65B9;&#x6CD5;&#x6700;&#x7EC8;&#x8C03;&#x7528;&#x7684;&#x662F;<code>reconcileChildFibers</code></p><p><code>mountChildFibers</code>&#x548C;<code>reconcileChildFibers</code>&#x65B9;&#x6CD5;&#x662F;&#x4E00;&#x6837;&#x7684;&#xFF0C;&#x552F;&#x4E00;&#x7684;&#x533A;&#x522B;&#x662F;&#x751F;&#x6210;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x65F6;&#x5019;&#x7684;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x4E0D;&#x540C;</p><pre><code class="lang-js"><span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> reconcileChildFibers = ChildReconciler(<span class="hljs-literal">true</span>)
<span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> mountChildFibers = ChildReconciler(<span class="hljs-literal">false</span>)</code></pre>
<p>&#x8FD9;&#x4E2A;&#x53C2;&#x6570;&#x53EB;<code>shouldTrackSideEffects</code>&#xFF0C;&#x4ED6;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x5224;&#x65AD;&#x662F;&#x5426;&#x8981;&#x589E;&#x52A0;&#x4E00;&#x4E9B;<code>effectTag</code>&#xFF0C;&#x4E3B;&#x8981;&#x662F;&#x7528;&#x6765;&#x4F18;&#x5316;&#x521D;&#x6B21;&#x6E32;&#x67D3;&#x7684;&#xFF1A;</p><pre><code class="lang-js"><span class="hljs-keyword">if</span> (shouldTrackSideEffects &amp;&amp; newFiber.alternate === <span class="hljs-literal">null</span>) {
  newFiber.effectTag = Placement
}</code></pre>
</div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> Remove this and use reconcileChildrenAtExpirationTime directly.</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">reconcileChildren</span>(<span class="hljs-params">current, workInProgress, nextChildren</span>) </span>{
  reconcileChildrenAtExpirationTime(
    current,
    workInProgress,
    nextChildren,
    workInProgress.expirationTime,
  )
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">reconcileChildrenAtExpirationTime</span>(<span class="hljs-params">
  current,
  workInProgress,
  nextChildren,
  renderExpirationTime,
</span>) </span>{
  <span class="hljs-keyword">if</span> (current === <span class="hljs-literal">null</span>) {
    workInProgress.child = mountChildFibers(
      workInProgress,
      <span class="hljs-literal">null</span>,
      nextChildren,
      renderExpirationTime,
    )
  } <span class="hljs-keyword">else</span> {
    workInProgress.child = reconcileChildFibers(
      workInProgress,
      current.child,
      nextChildren,
      renderExpirationTime,
    )
  }
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="reconcilechildfibers">reconcileChildFibers</h1><p>&#x8FD9;&#x662F;&#x4E2A;&#x5165;&#x53E3;&#x65B9;&#x6CD5;&#xFF0C;&#x4F1A;&#x6839;&#x636E;<code>newChild</code>&#x7684;&#x4E0D;&#x540C;&#x7C7B;&#x578B;&#x8FDB;&#x884C;&#x5BF9;&#x5E94;&#x7684;&#x5904;&#x7406;&#xFF0C;&#x8FD9;&#x91CC;&#x4F1A;&#x8FDB;&#x884C;&#x62C6;&#x5206;&#x5BF9;&#x4E0D;&#x540C;&#x7C7B;&#x578B;&#x7684;&#x5904;&#x7406;&#x65B9;&#x6CD5;&#x8FDB;&#x884C;&#x5355;&#x72EC;&#x7684;&#x8BB2;&#x89E3;&#x3002;</p><p><code>reconcileChildFibers</code>&#x6700;&#x7EC8;&#x7684;&#x8FD4;&#x56DE;&#x662F;&#x5F53;&#x524D;&#x8282;&#x70B9;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x5B69;&#x5B50;&#x8282;&#x70B9;&#xFF0C;&#x4F1A;&#x5728;<code>performUnitWork</code>&#x4E2D; return &#x5E76;&#x8D4B;&#x503C;&#x7ED9;<code>nextUnitOfWork</code></p><p><code>children</code>&#x7684;&#x5408;&#x6CD5;&#x7C7B;&#x578B;&#xFF1A;</p><ul><li><code>ReactElement</code>&#xFF0C;&#x901A;&#x8FC7;<code>createElement</code>&#x548C;<code>ReactDOM.createPortal</code>&#x521B;&#x5EFA;&#xFF0C;<code>$$typeof</code>&#x4E0D;&#x540C;
</li>
<li><code>string</code>&#x6216;&#x8005;<code>number</code>&#xFF0C;<code>&lt;div&gt;abc&lt;/div&gt;</code>&#x4E2D;<code>div</code>&#x7684;<code>children</code>&#x5C31;&#x662F;<code>&quot;abc&quot;</code>
</li>
<li><code>[// renderAble]</code>&#x6570;&#x7EC4;&#xFF0C;&#x6BCF;&#x4E00;&#x9879;&#x90FD;&#x53EF;&#x4EE5;&#x662F;&#x5176;&#x4ED6;&#x5408;&#x6CD5;&#x7C7B;&#x578B;&#xFF0C;&#x4E0D;&#x80FD;&#x5D4C;&#x5957;
</li>
<li><code>Iterator</code>&#xFF0C;&#x8DDF;&#x6570;&#x7EC4;&#x7C7B;&#x4F3C;&#xFF0C;&#x53EA;&#x662F;&#x904D;&#x5386;&#x65B9;&#x5F0F;&#x4E0D;&#x540C;
</li>
<li><p><code>React.ConcurrentMode</code>&#x8FD9;&#x4E9B;&#x5185;&#x7F6E;&#x7EC4;&#x4EF6;&#xFF0C;&#x6700;&#x7EC8;&#x4F1A;&#x8F6C;&#x6362;&#x6210;<code>ReactElement</code>&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x662F;<code>ReactElement.type</code></p></li>
<li><p><a href="reconcile-children/single.html"><code>reconcileSingleElement</code> &amp; <code>reconcileSinglePortal</code> &amp; <code>reconcileSingleTextNode</code></a></p></li>
<li><p><a href="reconcile-children/array.html"><code>reconcileChildrenArray</code> &amp; <code>reconcileChildrenArray</code></a></p></li></ul>
</div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">reconcileChildFibers</span>(<span class="hljs-params">
  returnFiber: Fiber,
  currentFirstChild: Fiber | null,
  newChild: any,
  expirationTime: ExpirationTime,
</span>): <span class="hljs-title">Fiber</span> | <span class="hljs-title">null</span> </span>{
  <span class="hljs-keyword">const</span> isUnkeyedTopLevelFragment =
    <span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;object&apos;</span> &amp;&amp;
    newChild !== <span class="hljs-literal">null</span> &amp;&amp;
    newChild.type === REACT_FRAGMENT_TYPE &amp;&amp;
    newChild.key === <span class="hljs-literal">null</span>
  <span class="hljs-keyword">if</span> (isUnkeyedTopLevelFragment) {
    newChild = newChild.props.children
  }

  <span class="hljs-comment">// Handle object types</span>
  <span class="hljs-keyword">const</span> isObject = <span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;object&apos;</span> &amp;&amp; newChild !== <span class="hljs-literal">null</span>

  <span class="hljs-keyword">if</span> (isObject) {
    <span class="hljs-keyword">switch</span> (newChild.$$<span class="hljs-keyword">typeof</span>) {
      <span class="hljs-keyword">case</span> REACT_ELEMENT_TYPE:
        <span class="hljs-keyword">return</span> placeSingleChild(
          reconcileSingleElement(
            returnFiber,
            currentFirstChild,
            newChild,
            expirationTime,
          ),
        )
      <span class="hljs-keyword">case</span> REACT_PORTAL_TYPE:
        <span class="hljs-keyword">return</span> placeSingleChild(
          reconcileSinglePortal(
            returnFiber,
            currentFirstChild,
            newChild,
            expirationTime,
          ),
        )
    }
  }

  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;string&apos;</span> || <span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;number&apos;</span>) {
    <span class="hljs-keyword">return</span> placeSingleChild(
      reconcileSingleTextNode(
        returnFiber,
        currentFirstChild,
        <span class="hljs-string">&apos;&apos;</span> + newChild,
        expirationTime,
      ),
    )
  }

  <span class="hljs-keyword">if</span> (isArray(newChild)) {
    <span class="hljs-keyword">return</span> reconcileChildrenArray(
      returnFiber,
      currentFirstChild,
      newChild,
      expirationTime,
    )
  }

  <span class="hljs-keyword">if</span> (getIteratorFn(newChild)) {
    <span class="hljs-keyword">return</span> reconcileChildrenIterator(
      returnFiber,
      currentFirstChild,
      newChild,
      expirationTime,
    )
  }

  <span class="hljs-keyword">if</span> (isObject) {
    throwOnInvalidObjectType(returnFiber, newChild)
  }

  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;undefined&apos;</span> &amp;&amp; !isUnkeyedTopLevelFragment) {
    <span class="hljs-keyword">switch</span> (returnFiber.tag) {
      <span class="hljs-keyword">case</span> ClassComponent:
      <span class="hljs-keyword">case</span> FunctionComponent: {
        <span class="hljs-keyword">const</span> Component = returnFiber.type
        invariant(
          <span class="hljs-literal">false</span>,
          <span class="hljs-string">&apos;%s(...): Nothing was returned from render. This usually means a &apos;</span> +
            <span class="hljs-string">&apos;return statement is missing. Or, to render nothing, &apos;</span> +
            <span class="hljs-string">&apos;return null.&apos;</span>,
          Component.displayName || Component.name || <span class="hljs-string">&apos;Component&apos;</span>,
        )
      }
    }
  }

  <span class="hljs-keyword">return</span> deleteRemainingChildren(returnFiber, currentFirstChild)
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="placesinglechild">placeSingleChild</h1><p>&#x5224;&#x65AD;&#x662F;&#x5426;&#x662F;&#x7B2C;&#x4E00;&#x6B21;&#x6E32;&#x67D3;&#xFF0C;&#x5982;&#x679C;&#x662F;&#x7684;&#x8BDD;&#x589E;&#x52A0;<code>Placement</code>&#x526F;&#x4F5C;&#x7528;&#xFF0C;&#x540E;&#x671F;&#x9700;&#x8981;&#x6302;&#x8F7D; DOM</p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">placeSingleChild</span>(<span class="hljs-params">newFiber: Fiber</span>): <span class="hljs-title">Fiber</span> </span>{
  <span class="hljs-keyword">if</span> (shouldTrackSideEffects &amp;&amp; newFiber.alternate === <span class="hljs-literal">null</span>) {
    newFiber.effectTag = Placement
  }
  <span class="hljs-keyword">return</span> newFiber
}</code></pre>
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